Bulletin d’avalanche

Jasper

Mar 16 – 17, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

20 cm of snow expected overnight.  If more snow falls than expected, the avalanche danger will rise to High in the Alpine. 

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    There will be 20-50 cm of unconsolidated storm snow on and above ice climbs.  This snow will be susceptible to solar, wind and human triggering forming loose snow avalanches.  Quantities will be large enough to knock climbers off their route. 

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Another 20 cm of snow is expected overnight, adding to the 80 cm that has fallen since  Wednesday.  This new snow will come in with light north winds and rest on previous wind slabs.  

Weather Forecast

Heavy snow to begin Saturday night with 20 cm expected.  Winds will shift to northerly and will drop to light.  Temperatures will fall as the snow begins.  The storm will be short lived and be finished sometime before noon on Sunday.  By Sunday afternoon the winds will shift back to light westerly, with cool temperatures and light flurries.

Snowpack Summary

Soft slabs have formed immediate below alpine ridgelines from previous moderate to strong West winds. 80+cm of snow has fallen since Wednesday. At treeline, soft slabs are sitting on a thin suncrust that is buried 80 cm deep in wind exposed south facing terrain.  Below treeline, 20-30 cm of unconsolidated snow is present over a base of weak facets.

Avalanche Summary

Large natural slab avalanches have run on steep alpine slopes.  Several large cornice failures have been observed in the past 48 hrs.  At treeline and below, mild temperatures and solar exposure provided the trigger for small loose wet slides south of the Icefields.

Confidence

Forecast snowfall amounts are uncertain on Sunday

Régions couvertes